Abd al-Malik bin Umayr (may Allah have mercy on him) said: Mu'awiyah (may Allah be pleased with him) said: "I have never stopped hoping for the caliphate since the Messenger of Allah (peace and blessings be upon him) said to me: 'If you come to rule, then do well.'"
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16899